EP 0299088 A1 19890118 - PRE-DRIVE CIRCUIT.
Title (en)
PRE-DRIVE CIRCUIT.
Title (de)
ANSTEUERSCHALTUNG.
Title (fr)
CIRCUIT DE PRE-EXCITATION.
Publication
Application
Priority
- JP 1938687 A 19870129
- JP 8800081 W 19880129
Abstract (en)
A MOS FET (Q1) of a switching circuit (1) is turned on/off, controlled by a pre-drive circuit (2) via a pulse transformer (T). For switching on, a drive transistor (Q2) on the primary side (P1) of the pulse transformer is turned on, which generates a voltage on the secondary side (51). This charges the gate (G) of the MOS FET (Q1) to the positive side and turns on the switch. For switching off, the drive transistor (Q2) is turned off and the gate (Q) is discharged via a current flow (IE). The MOS FET (Q1) is switched off when the gate voltage becomes zero. The gate voltage further drops until it reaches a negative level determined by a zener diode (ZD3), when another FET (Q3) is switched off, further current flow (IE) is prevented.
Abstract (fr)
Circuit de pré-excitation destiné à commander le commutateur d'un MOS FET par l'intermédiaire d'un transformateur d'impulsions. Entre la partie secondaire du transformateur d'impulsions et le MOS FET, on a prévu un élément qui déconnecte électriquement le transformateur d'impusions du MOS FET quand la tension entre la porte et le drain du MOS FET a accusé une certaine baisse dans le sens négatif, afin que la tension porte-drain ne devienne pas excessivement négative.
IPC 1-7
IPC 8 full level
H03K 17/695 (2006.01); H03K 17/0412 (2006.01); H03K 17/687 (2006.01); H03K 17/691 (2006.01)
CPC (source: EP US)
H03K 17/04123 (2013.01 - EP US); H03K 17/691 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 8805978 A1 19880811; DE 3889019 D1 19940519; DE 3889019 T2 19940721; EP 0299088 A1 19890118; EP 0299088 A4 19900514; EP 0299088 B1 19940413; JP H0561807 B2 19930907; JP S63187724 A 19880803; US 4967101 A 19901030
DOCDB simple family (application)
JP 8800081 W 19880129; DE 3889019 T 19880129; EP 88901312 A 19880129; JP 1938687 A 19870129; US 22488288 A 19880711